How to rebind in Laravel’s container?

I’m trying to add functionality similar to the user resolver in Laravel’s Request class.

I have a SaaS application. I’ve created a middleware class to look at the request host and fetch the corresponding account based on the domain. It looks like this:

public function handle($request, Closure $next)
{
    $host = $request->getHost();

    $domain = Domain::whereName($host)->firstOrFail();

    return $next($request);
}

I’ve extended the Request class with one in my application, and updated the reference in public/index.php to use this new class. I’ve also added three new methods:

public function account()
{
    return call_user_func($this->getAccountResolver());
}

public function getAccountResolver()
{
    return $this->accountResolver ?: function () {};
}

public function setAccountResolver(Closure $callback)
{
    $this->accountResolver = $callback;

    return $this;
}

The idea is, I want to be able to get the account from the request the same way I can get the currently logged-in user:

$user = $request->user();
$account = $request->account(); // My new method

I had a look in the Laravel codebase and they seem to use rebinding to add the user resolver. From the AuthServiceProvider class:

$this->app->rebinding('request', function ($app, $request) {
    $request->setUserResolver(function () use ($app) {
        return $app['auth']->user();
    });
});

So I replicated this in my middleware method:

$this->app->rebinding('request', function ($app, $request) use ($domain) {
    $request->setAccountResolver(function () use ($app, $domain) {
        return $domain->account; // Domain belongs to an Account
    });
});

But this doesn’t seem to get triggered. If I run dd($request) in the middleware I can see the $accountResolver property is an instance of a Closure (my callback), but when I dd($request) after the middleware class (say a controller action), the $accountResolver method is back to being null.

How can I get my account resolver to persist after my middleware, so that I can call $request->account() and get an Account instance throughout my application?

via Chebli Mohamed